diff options
| -rw-r--r-- | drivers/gpio/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 2 | ||||
| -rw-r--r-- | drivers/gpio/gpio-it87.c | 411 | ||||
| -rw-r--r-- | drivers/gpio/gpio-it8761e.c | 230 |
4 files changed, 422 insertions, 235 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 2026034879cb..63000b1f9da8 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -235,11 +235,17 @@ config GPIO_IOP If unsure, say N. -config GPIO_IT8761E - tristate "IT8761E GPIO support" - depends on X86 # unconditional access to IO space. +config GPIO_IT87 + tristate "IT87xx GPIO support" + depends on X86 # unconditional access to IO space. help - Say yes here to support GPIO functionality of IT8761E super I/O chip. + Say yes here to support GPIO functionality of IT87xx Super I/O chips. + + This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and + supports the IT8761E Super I/O chip as well. + + To compile this driver as a module, choose M here: the module will + be called gpio_it87 config GPIO_LOONGSON bool "Loongson-2/3 GPIO support" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 0d30b645965b..77a07e9d014a 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -40,7 +40,7 @@ obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o obj-$(CONFIG_GPIO_IOP) += gpio-iop.o -obj-$(CONFIG_GPIO_IT8761E) += gpio-it8761e.o +obj-$(CONFIG_GPIO_IT87) += gpio-it87.o obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o diff --git a/drivers/gpio/gpio-it87.c b/drivers/gpio/gpio-it87.c new file mode 100644 index 000000000000..21f6f7c0eb34 --- /dev/null +++ b/drivers/gpio/gpio-it87.c @@ -0,0 +1,411 @@ +/* + * GPIO interface for IT87xx Super I/O chips + * + * Author: Diego Elio Pettenò <flameeyes@flameeyes.eu> + * + * Based on it87_wdt.c by Oliver Schuster + * gpio-it8761e.c by Denis Turischev + * gpio-stmpe.c by Rabin Vincent + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/gpio.h> + +/* Chip Id numbers */ +#define NO_DEV_ID 0xffff +#define IT8728_ID 0x8728 +#define IT8732_ID 0x8732 +#define IT8761_ID 0x8761 + +/* IO Ports */ +#define REG 0x2e +#define VAL 0x2f + +/* Logical device Numbers LDN */ +#define GPIO 0x07 + +/* Configuration Registers and Functions */ +#define LDNREG 0x07 +#define CHIPID 0x20 +#define CHIPREV 0x22 + +/** + * struct it87_gpio - it87-specific GPIO chip + * @chip the underlying gpio_chip structure + * @lock a lock to avoid races between operations + * @io_base base address for gpio ports + * @io_size size of the port rage starting from io_base. + * @output_base Super I/O register address for Output Enable register + * @simple_base Super I/O 'Simple I/O' Enable register + * @simple_size Super IO 'Simple I/O' Enable register size; this is + * required because IT87xx chips might only provide Simple I/O + * switches on a subset of lines, whereas the others keep the + * same status all time. + */ +struct it87_gpio { + struct gpio_chip chip; + spinlock_t lock; + u16 io_base; + u16 io_size; + u8 output_base; + u8 simple_base; + u8 simple_size; +}; + +static struct it87_gpio it87_gpio_chip = { + .lock = __SPIN_LOCK_UNLOCKED(it87_gpio_chip.lock), +}; + +static inline struct it87_gpio *to_it87_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct it87_gpio, chip); +} + +/* Superio chip access functions; copied from wdt_it87 */ + +static inline int superio_enter(void) +{ + /* + * Try to reserve REG and REG + 1 for exclusive access. + */ + if (!request_muxed_region(REG, 2, KBUILD_MODNAME)) + return -EBUSY; + + outb(0x87, REG); + outb(0x01, REG); + outb(0x55, REG); + outb(0x55, REG); + return 0; +} + +static inline void superio_exit(void) +{ + outb(0x02, REG); + outb(0x02, VAL); + release_region(REG, 2); +} + +static inline void superio_select(int ldn) +{ + outb(LDNREG, REG); + outb(ldn, VAL); +} + +static inline int superio_inb(int reg) +{ + outb(reg, REG); + return inb(VAL); +} + +static inline void superio_outb(int val, int reg) +{ + outb(reg, REG); + outb(val, VAL); +} + +static inline int superio_inw(int reg) +{ + int val; + + outb(reg++, REG); + val = inb(VAL) << 8; + outb(reg, REG); + val |= inb(VAL); + return val; +} + +static inline void superio_outw(int val, int reg) +{ + outb(reg++, REG); + outb(val >> 8, VAL); + outb(reg, REG); + outb(val, VAL); +} + +static inline void superio_set_mask(int mask, int reg) +{ + u8 curr_val = superio_inb(reg); + u8 new_val = curr_val | mask; + + if (curr_val != new_val) + superio_outb(new_val, reg); +} + +static inline void superio_clear_mask(int mask, int reg) +{ + u8 curr_val = superio_inb(reg); + u8 new_val = curr_val & ~mask; + + if (curr_val != new_val) + superio_outb(new_val, reg); +} + +static int it87_gpio_request(struct gpio_chip *chip, unsigned gpio_num) +{ + u8 mask, group; + int rc = 0; + struct it87_gpio *it87_gpio = to_it87_gpio(chip); + + mask = 1 << (gpio_num % 8); + group = (gpio_num / 8); + + spin_lock(&it87_gpio->lock); + + rc = superio_enter(); + if (rc) + goto exit; + + /* not all the IT87xx chips support Simple I/O and not all of + * them allow all the lines to be set/unset to Simple I/O. + */ + if (group < it87_gpio->simple_size) + superio_set_mask(mask, group + it87_gpio->simple_base); + + /* clear output enable, setting the pin to input, as all the + * newly-exported GPIO interfaces are set to input. + */ + superio_clear_mask(mask, group + it87_gpio->output_base); + + superio_exit(); + +exit: + spin_unlock(&it87_gpio->lock); + return rc; +} + +static int it87_gpio_get(struct gpio_chip *chip, unsigned gpio_num) +{ + u16 reg; + u8 mask; + struct it87_gpio *it87_gpio = to_it87_gpio(chip); + + mask = 1 << (gpio_num % 8); + reg = (gpio_num / 8) + it87_gpio->io_base; + + return !!(inb(reg) & mask); +} + +static int it87_gpio_direction_in(struct gpio_chip *chip, unsigned gpio_num) +{ + u8 mask, group; + int rc = 0; + struct it87_gpio *it87_gpio = to_it87_gpio(chip); + + mask = 1 << (gpio_num % 8); + group = (gpio_num / 8); + + spin_lock(&it87_gpio->lock); + + rc = superio_enter(); + if (rc) + goto exit; + + /* clear the output enable bit */ + superio_clear_mask(mask, group + it87_gpio->output_base); + + superio_exit(); + +exit: + spin_unlock(&it87_gpio->lock); + return rc; +} + +static void it87_gpio_set(struct gpio_chip *chip, + unsigned gpio_num, int val) +{ + u8 mask, curr_vals; + u16 reg; + struct it87_gpio *it87_gpio = to_it87_gpio(chip); + + mask = 1 << (gpio_num % 8); + reg = (gpio_num / 8) + it87_gpio->io_base; + + curr_vals = inb(reg); + if (val) + outb(curr_vals | mask, reg); + else + outb(curr_vals & ~mask, reg); +} + +static int it87_gpio_direction_out(struct gpio_chip *chip, + unsigned gpio_num, int val) +{ + u8 mask, group; + int rc = 0; + struct it87_gpio *it87_gpio = to_it87_gpio(chip); + + mask = 1 << (gpio_num % 8); + group = (gpio_num / 8); + + spin_lock(&it87_gpio->lock); + + rc = superio_enter(); + if (rc) + goto exit; + + /* set the output enable bit */ + superio_set_mask(mask, group + it87_gpio->output_base); + + it87_gpio_set(chip, gpio_num, val); + + superio_exit(); + +exit: + spin_unlock(&it87_gpio->lock); + return rc; +} + +static struct gpio_chip it87_template_chip = { + .label = KBUILD_MODNAME, + .owner = THIS_MODULE, + .request = it87_gpio_request, + .get = it87_gpio_get, + .direction_input = it87_gpio_direction_in, + .set = it87_gpio_set, + .direction_output = it87_gpio_direction_out, + .base = -1 +}; + +static int __init it87_gpio_init(void) +{ + int rc = 0, i; + u16 chip_type; + u8 chip_rev, gpio_ba_reg; + char *labels, **labels_table; + + struct it87_gpio *it87_gpio = &it87_gpio_chip; + + rc = superio_enter(); + if (rc) + return rc; + + chip_type = superio_inw(CHIPID); + chip_rev = superio_inb(CHIPREV) & 0x0f; + superio_exit(); + + it87_gpio->chip = it87_template_chip; + + switch (chip_type) { + case IT8728_ID: + case IT8732_ID: + gpio_ba_reg = 0x62; + it87_gpio->io_size = 8; + it87_gpio->output_base = 0xc8; + it87_gpio->simple_base = 0xc0; + it87_gpio->simple_size = 5; + it87_gpio->chip.ngpio = 64; + break; + case IT8761_ID: + gpio_ba_reg = 0x60; + it87_gpio->io_size = 4; + it87_gpio->output_base = 0xf0; + it87_gpio->simple_size = 0; + it87_gpio->chip.ngpio = 16; + break; + case NO_DEV_ID: + pr_err("no device\n"); + return -ENODEV; + default: + pr_err("Unknown Chip found, Chip %04x Revision %x\n", + chip_type, chip_rev); + return -ENODEV; + } + + rc = superio_enter(); + if (rc) + return rc; + + superio_select(GPIO); + + /* fetch GPIO base address */ + it87_gpio->io_base = superio_inw(gpio_ba_reg); + + superio_exit(); + + pr_info("Found Chip IT%04x rev %x. %u GPIO lines starting at %04xh\n", + chip_type, chip_rev, it87_gpio->chip.ngpio, + it87_gpio->io_base); + + if (!request_region(it87_gpio->io_base, it87_gpio->io_size, + KBUILD_MODNAME)) + return -EBUSY; + + /* Set up aliases for the GPIO connection. + * + * ITE documentation for recent chips such as the IT8728F + * refers to the GPIO lines as GPxy, with a coordinates system + * where x is the GPIO group (starting from 1) and y is the + * bit within the group. + * + * By creating these aliases, we make it easier to understand + * to which GPIO pin we're referring to. + */ + labels = kcalloc(it87_gpio->chip.ngpio, sizeof("it87_gpXY"), + GFP_KERNEL); + labels_table = kcalloc(it87_gpio->chip.ngpio, sizeof(const char *), + GFP_KERNEL); + + if (!labels || !labels_table) { + rc = -ENOMEM; + goto labels_free; + } + + for (i = 0; i < it87_gpio->chip.ngpio; i++) { + char *label = &labels[i * sizeof("it87_gpXY")]; + + sprintf(label, "it87_gp%u%u", 1+(i/8), i%8); + labels_table[i] = label; + } + + it87_gpio->chip.names = (const char *const*)labels_table; + + rc = gpiochip_add(&it87_gpio->chip); + if (rc) + goto labels_free; + + return 0; + +labels_free: + kfree(labels_table); + kfree(labels); + release_region(it87_gpio->io_base, it87_gpio->io_size); + return rc; +} + +static void __exit it87_gpio_exit(void) +{ + struct it87_gpio *it87_gpio = &it87_gpio_chip; + + gpiochip_remove(&it87_gpio->chip); + release_region(it87_gpio->io_base, it87_gpio->io_size); + kfree(it87_gpio->chip.names[0]); + kfree(it87_gpio->chip.names); +} + +module_init(it87_gpio_init); +module_exit(it87_gpio_exit); + +MODULE_AUTHOR("Diego Elio Pettenò <flameeyes@flameeyes.eu>"); +MODULE_DESCRIPTION("GPIO interface for IT87xx Super I/O chips"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpio/gpio-it8761e.c b/drivers/gpio/gpio-it8761e.c deleted file mode 100644 index 30a8f24c92c5..000000000000 --- a/drivers/gpio/gpio-it8761e.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - * GPIO interface for IT8761E Super I/O chip - * - * Author: Denis Turischev <denis@compulab.co.il> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License 2 as published - * by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; see the file COPYING. If not, write to - * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/errno.h> -#include <linux/ioport.h> - -#include <linux/gpio.h> - -#define SIO_CHIP_ID 0x8761 -#define CHIP_ID_HIGH_BYTE 0x20 -#define CHIP_ID_LOW_BYTE 0x21 - -static u8 ports[2] = { 0x2e, 0x4e }; -static u8 port; - -static DEFINE_SPINLOCK(sio_lock); - -#define GPIO_NAME "it8761-gpio" -#define GPIO_BA_HIGH_BYTE 0x60 -#define GPIO_BA_LOW_BYTE 0x61 -#define GPIO_IOSIZE 4 -#define GPIO1X_IO 0xf0 -#define GPIO2X_IO 0xf1 - -static u16 gpio_ba; - -static u8 read_reg(u8 addr, u8 port) -{ - outb(addr, port); - return inb(port + 1); -} - -static void write_reg(u8 data, u8 addr, u8 port) -{ - outb(addr, port); - outb(data, port + 1); -} - -static void enter_conf_mode(u8 port) -{ - outb(0x87, port); - outb(0x61, port); - outb(0x55, port); - outb((port == 0x2e) ? 0x55 : 0xaa, port); -} - -static void exit_conf_mode(u8 port) -{ - outb(0x2, port); - outb(0x2, port + 1); -} - -static void enter_gpio_mode(u8 port) -{ - write_reg(0x2, 0x7, port); -} - -static int it8761e_gpio_get(struct gpio_chip *gc, unsigned gpio_num) -{ - u16 reg; - u8 bit; - - bit = gpio_num % 8; - reg = (gpio_num >= 8) ? gpio_ba + 1 : gpio_ba; - - return !!(inb(reg) & (1 << bit)); -} - -static int it8761e_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num) -{ - u8 curr_dirs; - u8 io_reg, bit; - - bit = gpio_num % 8; - io_reg = (gpio_num >= 8) ? GPIO2X_IO : GPIO1X_IO; - - spin_lock(&sio_lock); - - enter_conf_mode(port); - enter_gpio_mode(port); - - curr_dirs = read_reg(io_reg, port); - - if (curr_dirs & (1 << bit)) - write_reg(curr_dirs & ~(1 << bit), io_reg, port); - - exit_conf_mode(port); - - spin_unlock(&sio_lock); - return 0; -} - -static void it8761e_gpio_set(struct gpio_chip *gc, - unsigned gpio_num, int val) -{ - u8 curr_vals, bit; - u16 reg; - - bit = gpio_num % 8; - reg = (gpio_num >= 8) ? gpio_ba + 1 : gpio_ba; - - spin_lock(&sio_lock); - - curr_vals = inb(reg); - if (val) - outb(curr_vals | (1 << bit), reg); - else - outb(curr_vals & ~(1 << bit), reg); - - spin_unlock(&sio_lock); -} - -static int it8761e_gpio_direction_out(struct gpio_chip *gc, - unsigned gpio_num, int val) -{ - u8 curr_dirs, io_reg, bit; - - bit = gpio_num % 8; - io_reg = (gpio_num >= 8) ? GPIO2X_IO : GPIO1X_IO; - - it8761e_gpio_set(gc, gpio_num, val); - - spin_lock(&sio_lock); - - enter_conf_mode(port); - enter_gpio_mode(port); - - curr_dirs = read_reg(io_reg, port); - - if (!(curr_dirs & (1 << bit))) - write_reg(curr_dirs | (1 << bit), io_reg, port); - - exit_conf_mode(port); - - spin_unlock(&sio_lock); - return 0; -} - -static struct gpio_chip it8761e_gpio_chip = { - .label = GPIO_NAME, - .owner = THIS_MODULE, - .get = it8761e_gpio_get, - .direction_input = it8761e_gpio_direction_in, - .set = it8761e_gpio_set, - .direction_output = it8761e_gpio_direction_out, -}; - -static int __init it8761e_gpio_init(void) -{ - int i, id, err; - - /* chip and port detection */ - for (i = 0; i < ARRAY_SIZE(ports); i++) { - spin_lock(&sio_lock); - enter_conf_mode(ports[i]); - - id = (read_reg(CHIP_ID_HIGH_BYTE, ports[i]) << 8) + - read_reg(CHIP_ID_LOW_BYTE, ports[i]); - - exit_conf_mode(ports[i]); - spin_unlock(&sio_lock); - - if (id == SIO_CHIP_ID) { - port = ports[i]; - break; - } - } - - if (!port) - return -ENODEV; - - /* fetch GPIO base address */ - enter_conf_mode(port); - enter_gpio_mode(port); - gpio_ba = (read_reg(GPIO_BA_HIGH_BYTE, port) << 8) + - read_reg(GPIO_BA_LOW_BYTE, port); - exit_conf_mode(port); - - if (!request_region(gpio_ba, GPIO_IOSIZE, GPIO_NAME)) - return -EBUSY; - - it8761e_gpio_chip.base = -1; - it8761e_gpio_chip.ngpio = 16; - - err = gpiochip_add(&it8761e_gpio_chip); - if (err < 0) - goto gpiochip_add_err; - - return 0; - -gpiochip_add_err: - release_region(gpio_ba, GPIO_IOSIZE); - gpio_ba = 0; - return err; -} - -static void __exit it8761e_gpio_exit(void) -{ - if (gpio_ba) { - gpiochip_remove(&it8761e_gpio_chip); - release_region(gpio_ba, GPIO_IOSIZE); - gpio_ba = 0; - } -} -module_init(it8761e_gpio_init); -module_exit(it8761e_gpio_exit); - -MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); -MODULE_DESCRIPTION("GPIO interface for IT8761E Super I/O chip"); -MODULE_LICENSE("GPL"); |